Document Detail


Lentiviral-mediated knockdown during ex vivo erythropoiesis of human hematopoietic stem cells.
MedLine Citation:
PMID:  21785407     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Erythropoiesis is a commonly used model system to study cell differentiation. During erythropoiesis, pluripotent adult human hematopoietic stem cells (HSCs) differentiate into oligopotent progenitors, committed precursors and mature red blood cells. This process is regulated for a large part at the level of gene expression, whereby specific transcription factors activate lineage-specific genes while concomitantly repressing genes that are specific to other cell types. Studies on transcription factors regulating erythropoiesis are often performed using human and murine cell lines that represent, to some extent, erythroid cells at given stages of differentiation. However transformed cell lines can only partially mimic erythroid cells and most importantly they do not allow one to comprehensibly study the dynamic changes that occur as cells progress through many stages towards their final erythroid fate. Therefore, a current challenge remains the development of a protocol to obtain relatively homogenous populations of primary HSCs and erythroid cells at various stages of differentiation in quantities that are sufficient to perform genomics and proteomics experiments. Here we describe an ex vivo cell culture protocol to induce erythroid differentiation from human hematopoietic stem/progenitor cells that have been isolated from either cord blood, bone marrow, or adult peripheral blood mobilized with G-CSF (leukapheresis). This culture system, initially developed by the Douay laboratory, uses cytokines and co-culture on mesenchymal cells to mimic the bone marrow microenvironment. Using this ex vivo differentiation protocol, we observe a strong amplification of erythroid progenitors, an induction of differentiation exclusively towards the erythroid lineage and a complete maturation to the stage of enucleated red blood cells. Thus, this system provides an opportunity to study the molecular mechanism of transcriptional regulation as hematopoietic stem cells progress along the erythroid lineage. Studying erythropoiesis at the transcriptional level also requires the ability to over-express or knockdown specific factors in primary erythroid cells. For this purpose, we use a lentivirus-mediated gene delivery system that allows for the efficient infection of both dividing and non-dividing cells. Here we show that we are able to efficiently knockdown the transcription factor TAL1 in primary human erythroid cells. In addition, GFP expression demonstrates an efficiency of lentiviral infection close to 90%. Thus, our protocol provides a highly useful system for characterization of the regulatory network of transcription factors that control erythropoiesis.
Authors:
Carmen G Palii; Roya Pasha; Marjorie Brand
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Video-Audio Media     Date:  2011-07-16
Journal Detail:
Title:  Journal of visualized experiments : JoVE     Volume:  -     ISSN:  1940-087X     ISO Abbreviation:  J Vis Exp     Publication Date:  2011  
Date Detail:
Created Date:  2011-07-25     Completed Date:  2011-09-16     Revised Date:  2013-07-18    
Medline Journal Info:
Nlm Unique ID:  101313252     Medline TA:  J Vis Exp     Country:  United States    
Other Details:
Languages:  eng     Pagination:  -     Citation Subset:  IM    
Affiliation:
The Sprott Center for Stem Cell Research, Regenerative Medicine Program, Ottawa Hospital Research Institute.
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MeSH Terms
Descriptor/Qualifier:
Basic Helix-Loop-Helix Transcription Factors / deficiency,  genetics
Cell Culture Techniques / methods*
Cell Differentiation / genetics,  physiology
Erythropoiesis / genetics,  physiology*
Gene Knockdown Techniques / methods*
Green Fluorescent Proteins / biosynthesis,  genetics
Hematopoietic Stem Cells / cytology,  physiology*
Humans
Lentivirus / genetics*
Proto-Oncogene Proteins / deficiency,  genetics
Grant Support
ID/Acronym/Agency:
MOP-82813//Canadian Institutes of Health Research
Chemical
Reg. No./Substance:
0/Basic Helix-Loop-Helix Transcription Factors; 0/Proto-Oncogene Proteins; 135471-20-4/TAL1 protein, human; 147336-22-9/Green Fluorescent Proteins
Comments/Corrections

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